ASTM E1304-97(2020)
Standard Test Method for Plane-Strain (Chevron-Notch) Fracture Toughness of Metallic Materials

Standard No.

ASTM E1304-97(2020)

Release Date

2020

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM E1304-97(2020)

Scope

1.1 This test method covers the determination of planestrain (chevron-notch) fracture toughnesses, KIv or KIvM, of metallic materials. Fracture toughness by this method is relative to a slowly advancing steady state crack initiated at a chevron-shaped notch, and propagating in a chevron-shaped ligament (Fig. 1). Some metallic materials, when tested by this method, exhibit a sporadic crack growth in which the crack front remains nearly stationary until a critical load is reached. The crack then becomes unstable and suddenly advances at high speed to the next arrest point. For these materials, this test method covers the determination of the plane-strain fracture toughness, KIvj or KIvM, relative to the crack at the points of instability. NOTE 1—One difference between this test method and Test Method E399 (which measures KIc) is that Test Method E399 centers attention on the start of crack extension from a fatigue precrack. This test method makes use of either a steady state slowly propagating crack, or a crack at the initiation of a crack jump. Although both methods are based on the principles of linear elastic fracture mechanics, this difference, plus other differences in test procedure, may cause the values from this test method to be larger than KIc values in some materials. Therefore, toughness values determined by this test method cannot be used interchangeably with KIc. 1.2 This test method uses either chevron-notched rod specimens of circular cross section, or chevron-notched bar specimens of square or rectangular cross section (Figs. 1-10). The terms “short rod” and “short bar” are used commonly for these types of chevron-notched specimens. 1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM E1304-97(2020) Referenced Document

• ASTM E1823 Standard Terminology Relating to Fatigue and Fracture Testing
• ASTM E399 Standard Test Method for Plane-Strain Fracture Toughness of Metallic Materials
• ASTM E4 Standard Practices for Force Verification of Testing Machines
• ASTM E8/E8M Standard Test Methods for Tension Testing of Metallic Materials*， 2024-01-01 Update

ASTM E1304-97(2020) history

• 2020 ASTM E1304-97(2020) Standard Test Method for Plane-Strain (Chevron-Notch) Fracture Toughness of Metallic Materials
• 2014 ASTM E1304-97(2014)e1 Standard Test Method for Plane-Strain (Chevron-Notch) Fracture Toughness of Metallic Materials
• 1997 ASTM E1304-97(2014) Standard Test Method for Plane-Strain &40;Chevron-Notch&41; Fracture Toughness of Metallic Materials
• 1997 ASTM E1304-97(2008)e1 Standard Test Method for Plane-Strain (Chevron-Notch) Fracture Toughness of Metallic Materials
• 1997 ASTM E1304-97(2008) Standard Test Method for Plane-Strain (Chevron-Notch) Fracture Toughness of Metallic Materials
• 1997 ASTM E1304-97(2002) Standard Test Method for Plane-Strain (Chevron-Notch) Fracture Toughness of Metallic Materials
• 1997 ASTM E1304-97 Standard Test Method for Plane-Strain (Chevron-Notch) Fracture Toughness of Metallic Materials